Shell evolution of stable N=50-56 Zr and Mo nuclei with respect to low-lying octupole excitations

E. T. Gregor, Marcus Scheck, R. Chapman, L. P. Gaffney, J. Keatings, K.R. Mashtakov, David O'Donnell, J. F. Smith, P. Spagnoletti, M. Thuerauf, V. Werner, Callum Wiseman

Research output: Research - peer-reviewArticle

Abstract

For the N = 50-56 zirconium (Z = 40) and molybdenum (Z = 42) isotopes, the evolution of subshells is evaluated by extracting the effective single-particle energies from available particle-transfer data. The extracted systematic evolution of neutron subshells and the systematics of the excitation energy of the octupole phonons provide evidence for type-II shape coexistence in the Zr isotopes. Employing a simplistic approach, the relative effective single-particle energies are used to estimate whether the formation of low-lying octupole-isovector excitations is possible at the proposed energies. The results raise doubts about this assignment.
LanguageEnglish
Article number50
JournalEUROPEAN PHYSICAL JOURNAL A
Volume53
DOIs
StatePublished - 15 Mar 2017

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particle energy
isotopes
nuclei
excitation
energy
molybdenum
phonons
neutrons
estimates

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Gregor, E. T., Scheck, M., Chapman, R., Gaffney, L. P., Keatings, J., Mashtakov, K. R., ... Wiseman, C. (2017). Shell evolution of stable N=50-56 Zr and Mo nuclei with respect to low-lying octupole excitations. EUROPEAN PHYSICAL JOURNAL A, 53, [50]. DOI: 10.1140/epja/i2017-12224-7
Gregor, E. T. ; Scheck, Marcus ; Chapman, R. ; Gaffney, L. P. ; Keatings, J. ; Mashtakov, K.R. ; O'Donnell, David ; Smith, J. F. ; Spagnoletti, P. ; Thuerauf, M. ; Werner, V. ; Wiseman, Callum. / Shell evolution of stable N=50-56 Zr and Mo nuclei with respect to low-lying octupole excitations. In: EUROPEAN PHYSICAL JOURNAL A. 2017 ; Vol. 53.
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title = "Shell evolution of stable N=50-56 Zr and Mo nuclei with respect to low-lying octupole excitations",
abstract = "For the N = 50-56 zirconium (Z = 40) and molybdenum (Z = 42) isotopes, the evolution of subshells is evaluated by extracting the effective single-particle energies from available particle-transfer data. The extracted systematic evolution of neutron subshells and the systematics of the excitation energy of the octupole phonons provide evidence for type-II shape coexistence in the Zr isotopes. Employing a simplistic approach, the relative effective single-particle energies are used to estimate whether the formation of low-lying octupole-isovector excitations is possible at the proposed energies. The results raise doubts about this assignment.",
author = "Gregor, {E. T.} and Marcus Scheck and R. Chapman and Gaffney, {L. P.} and J. Keatings and K.R. Mashtakov and David O'Donnell and Smith, {J. F.} and P. Spagnoletti and M. Thuerauf and V. Werner and Callum Wiseman",
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Gregor, ET, Scheck, M, Chapman, R, Gaffney, LP, Keatings, J, Mashtakov, KR, O'Donnell, D, Smith, JF, Spagnoletti, P, Thuerauf, M, Werner, V & Wiseman, C 2017, 'Shell evolution of stable N=50-56 Zr and Mo nuclei with respect to low-lying octupole excitations' EUROPEAN PHYSICAL JOURNAL A, vol 53, 50. DOI: 10.1140/epja/i2017-12224-7

Shell evolution of stable N=50-56 Zr and Mo nuclei with respect to low-lying octupole excitations. / Gregor, E. T.; Scheck, Marcus; Chapman, R.; Gaffney, L. P.; Keatings, J.; Mashtakov, K.R.; O'Donnell, David; Smith, J. F. ; Spagnoletti, P.; Thuerauf, M.; Werner, V.; Wiseman, Callum.

In: EUROPEAN PHYSICAL JOURNAL A, Vol. 53, 50, 15.03.2017.

Research output: Research - peer-reviewArticle

TY - JOUR

T1 - Shell evolution of stable N=50-56 Zr and Mo nuclei with respect to low-lying octupole excitations

AU - Gregor,E. T.

AU - Scheck,Marcus

AU - Chapman,R.

AU - Gaffney,L. P.

AU - Keatings,J.

AU - Mashtakov,K.R.

AU - O'Donnell,David

AU - Smith,J. F.

AU - Spagnoletti,P.

AU - Thuerauf,M.

AU - Werner,V.

AU - Wiseman,Callum

PY - 2017/3/15

Y1 - 2017/3/15

N2 - For the N = 50-56 zirconium (Z = 40) and molybdenum (Z = 42) isotopes, the evolution of subshells is evaluated by extracting the effective single-particle energies from available particle-transfer data. The extracted systematic evolution of neutron subshells and the systematics of the excitation energy of the octupole phonons provide evidence for type-II shape coexistence in the Zr isotopes. Employing a simplistic approach, the relative effective single-particle energies are used to estimate whether the formation of low-lying octupole-isovector excitations is possible at the proposed energies. The results raise doubts about this assignment.

AB - For the N = 50-56 zirconium (Z = 40) and molybdenum (Z = 42) isotopes, the evolution of subshells is evaluated by extracting the effective single-particle energies from available particle-transfer data. The extracted systematic evolution of neutron subshells and the systematics of the excitation energy of the octupole phonons provide evidence for type-II shape coexistence in the Zr isotopes. Employing a simplistic approach, the relative effective single-particle energies are used to estimate whether the formation of low-lying octupole-isovector excitations is possible at the proposed energies. The results raise doubts about this assignment.

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DO - 10.1140/epja/i2017-12224-7

M3 - Article

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JO - The European Physical Journal A

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JF - The European Physical Journal A

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Gregor ET, Scheck M, Chapman R, Gaffney LP, Keatings J, Mashtakov KR et al. Shell evolution of stable N=50-56 Zr and Mo nuclei with respect to low-lying octupole excitations. EUROPEAN PHYSICAL JOURNAL A. 2017 Mar 15;53. 50. Available from, DOI: 10.1140/epja/i2017-12224-7